xkcd

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I've taken to doing pushups with hands on these dumbells with freely rotating plates; not only does it let you go deeper, but the bells want to try to roll away from your center line, and the more tired you get the harder it gets to hold them close to you and not fall flat on your face.

After a while, it actually becomes easier to rest in the down position (not touching the ground, just suspended an inch above it), both because the bells are less inclined to roll, and because the tension in your shoulders from going so deep actually provides some support.

But yeah, the extra range of motion + need to expend energy keeping stable and keeping those bells from rolling away really adds some impact (and, I feel, makes them a bit more entertaining).